How to fix the Oracle error TNS-12689: Server Authentication required, but not supported?

In this post, you’ll learn more about the Oracle ErrorTNS-12689: Server Authentication required, but not supported with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-12689: Server Authentication required, but not supported

Reason for the Error TNS-12689: Server Authentication required, but not supported

Cause: Server Authentication is required for this connection, but not supported by both sides of the connection.

How to fix the Error TNS-12689: Server Authentication required, but not supported ?

You can fix this error in Oracle by following the below steps

Action: Make sure both sides of the connection have the correct version of Advanced Networking Option, and that the Authentication Adapter supports Server Authentication.